namespace System.Web.Util {
    using System;
 
    // IMPORTANT: Each error code must be used in *exactly one place* in order to make
    // diagnosing the failure easier.
 
    internal enum AppVerifierErrorCode {
 
        Ok,
 
        /* ASYNC OPERATIONS */
        HttpApplicationInstanceWasNull,
        BeginHandlerDelegateWasNull,
        AsyncCallbackInvokedMultipleTimes,
        AsyncCallbackInvokedWithNullParameter,
        AsyncCallbackGivenAsyncResultWhichWasNotCompleted,
        AsyncCallbackInvokedSynchronouslyButAsyncResultWasNotMarkedCompletedSynchronously,
        AsyncCallbackInvokedAsynchronouslyButAsyncResultWasMarkedCompletedSynchronously,
        AsyncCallbackInvokedWithUnexpectedAsyncResultInstance,
        AsyncCallbackInvokedAsynchronouslyThenBeginHandlerThrew,
        BeginHandlerThrewThenAsyncCallbackInvokedAsynchronously,
        AsyncCallbackInvokedSynchronouslyThenBeginHandlerThrew,
        AsyncCallbackInvokedWithUnexpectedAsyncResultAsyncState,
        AsyncCallbackCalledAfterHttpApplicationReassigned,
        BeginHandlerReturnedNull,
        BeginHandlerReturnedAsyncResultMarkedCompletedSynchronouslyButWhichWasNotCompleted,
        BeginHandlerReturnedAsyncResultMarkedCompletedSynchronouslyButAsyncCallbackNeverCalled,
        BeginHandlerReturnedUnexpectedAsyncResultInstance,
        BeginHandlerReturnedUnexpectedAsyncResultAsyncState,
        SyncContextSendOrPostCalledAfterRequestCompleted,
        SyncContextSendOrPostCalledBetweenNotifications,
        SyncContextPostCalledInNestedNotification,
        RequestNotificationCompletedSynchronouslyWithNotificationContextPending,
        NotificationContextHasChangedAfterSynchronouslyProcessingNotification,
        PendingProcessRequestNotificationStatusAfterCompletingNestedNotification
    }
}